function panEncrypt(str, pwd) {
    if (pwd == null || pwd.length <= 0) {
        alert("Please enter a password with which to encrypt the message.");
        return null;
    }
    var prand = "";
    for ( var i = 0; i < pwd.length; i++) {
        prand += pwd.charCodeAt(i).toString();
    }
    var sPos = Math.floor(prand.length / 5);
    var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2)
            + prand.charAt(sPos * 3) + prand.charAt(sPos * 4)
            + prand.charAt(sPos * 5));
    var incr = Math.ceil(pwd.length / 2);
    var modu = Math.pow(2, 31) - 1;
    if (mult < 2) {
        alert("Algorithm cannot find a suitable hash. Please choose a different password. \nPossible considerations are to choose a more complex or longer password.");
        return null;
    }
    var salt = Math.round(Math.random() * 1000000000) % 100000000;
    prand += salt;
    while (prand.length > 10) {
        prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(
                10, prand.length))).toString();
    }
    prand = (mult * prand + incr) % modu;
    var enc_chr = "";
    var enc_str = "";
    str = escape(str);

    for ( var i = 0; i < str.length; i++) {
        enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
        if (enc_chr < 16) {
            enc_str += "0" + enc_chr.toString(16);
        } else
            enc_str += enc_chr.toString(16);
        prand = (mult * prand + incr) % modu;
    }
    salt = salt.toString(16);
    while (salt.length < 8)
        salt = "0" + salt;
    enc_str += salt;
    return enc_str;
};
